drivers/mtd/maps/impa7.c

   1 /*
   2  * $Id: impa7.c,v 1.2 2002/09/05 05:11:24 acurtis Exp $
   3  *
   4  * Handle mapping of the NOR flash on implementa A7 boards
   5  *
   6  * Copyright 2002 SYSGO Real-Time Solutions GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <asm/io.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/config.h>
  20
  21 #ifdef CONFIG_MTD_PARTITIONS
  22 #include <linux/mtd/partitions.h>
  23 #endif
  24
  25 #define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
  26 #define WINDOW_SIZE0 0x00800000
  27 #define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
  28 #define WINDOW_SIZE1 0x00800000
  29 #define NUM_FLASHBANKS 2
  30 #define BUSWIDTH     4
  31
  32 /* can be { "cfi_probe", "jedec_probe", "map_rom", 0 }; */
  33 #define PROBETYPES { "jedec_probe", 0 }
  34
  35 #define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
  36 #define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
  37
  38 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS] = { 0 };
  39
  40 __u8 impa7_read8(struct map_info *map, unsigned long ofs)
  41 {
  42         return __raw_readb(map->map_priv_1 + ofs);
  43 }
  44
  45 __u16 impa7_read16(struct map_info *map, unsigned long ofs)
  46 {
  47         return __raw_readw(map->map_priv_1 + ofs);
  48 }
  49
  50 __u32 impa7_read32(struct map_info *map, unsigned long ofs)
  51 {
  52         return __raw_readl(map->map_priv_1 + ofs);
  53 }
  54
  55 void impa7_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  56 {
  57         memcpy_fromio(to, map->map_priv_1 + from, len);
  58 }
  59
  60 void impa7_write8(struct map_info *map, __u8 d, unsigned long adr)
  61 {
  62         __raw_writeb(d, map->map_priv_1 + adr);
  63         mb();
  64 }
  65
  66 void impa7_write16(struct map_info *map, __u16 d, unsigned long adr)
  67 {
  68         __raw_writew(d, map->map_priv_1 + adr);
  69         mb();
  70 }
  71
  72 void impa7_write32(struct map_info *map, __u32 d, unsigned long adr)
  73 {
  74         __raw_writel(d, map->map_priv_1 + adr);
  75         mb();
  76 }
  77
  78 void impa7_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  79 {
  80         memcpy_toio(map->map_priv_1 + to, from, len);
  81 }
  82
  83 static struct map_info impa7_map[NUM_FLASHBANKS] = {
  84         {
  85         name: "impA7 NOR Flash Bank #0",
  86         size: WINDOW_SIZE0,
  87         buswidth: BUSWIDTH,
  88         read8: impa7_read8,
  89         read16: impa7_read16,
  90         read32: impa7_read32,
  91         copy_from: impa7_copy_from,
  92         write8: impa7_write8,
  93         write16: impa7_write16,
  94         write32: impa7_write32,
  95         copy_to: impa7_copy_to
  96         },
  97         {
  98         name: "impA7 NOR Flash Bank #1",
  99         size: WINDOW_SIZE1,
 100         buswidth: BUSWIDTH,
 101         read8: impa7_read8,
 102         read16: impa7_read16,
 103         read32: impa7_read32,
 104         copy_from: impa7_copy_from,
 105         write8: impa7_write8,
 106         write16: impa7_write16,
 107         write32: impa7_write32,
 108         copy_to: impa7_copy_to
 109         },
 110 };
 111
 112 #ifdef CONFIG_MTD_PARTITIONS
 113
 114 /*
 115  * MTD partitioning stuff
 116  */
 117 static struct mtd_partition static_partitions[] =
 118 {
 119     {
 120         name: "FileSystem",
 121           size: 0x800000,
 122           offset: 0x00000000
 123     },
 124 };
 125
 126 #define NB_OF(x) (sizeof (x) / sizeof (x[0]))
 127
 128 #ifdef CONFIG_MTD_CMDLINE_PARTS
 129 int parse_cmdline_partitions(struct mtd_info *master,
 130                              struct mtd_partition **pparts,
 131                              const char *mtd_id);
 132 #endif
 133
 134 #endif
 135
 136 static int                   mtd_parts_nb = 0;
 137 static struct mtd_partition *mtd_parts    = 0;
 138
 139 int __init init_impa7(void)
 140 {
 141         static const char *rom_probe_types[] = PROBETYPES;
 142         const char **type;
 143         const char *part_type = 0;
 144         int i;
 145         static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
 146           { WINDOW_ADDR0, WINDOW_SIZE0 },
 147           { WINDOW_ADDR1, WINDOW_SIZE1 },
 148         };
 149         char mtdid[10];
 150         int devicesfound = 0;
 151
 152         for(i=0; i<NUM_FLASHBANKS; i++)
 153         {
 154                 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
 155                        pt[i].size, pt[i].addr);
 156                 impa7_map[i].map_priv_1 = (unsigned long)
 157                   ioremap(pt[i].addr, pt[i].size);
 158
 159                 if (!impa7_map[i].map_priv_1) {
 160                         printk(MSG_PREFIX "failed to ioremap\n");
 161                         return -EIO;
 162                 }
 163
 164                 impa7_mtd[i] = 0;
 165                 type = rom_probe_types;
 166                 for(; !impa7_mtd[i] && *type; type++) {
 167                         impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
 168                 }
 169
 170                 if (impa7_mtd[i])
 171                 {
 172                         impa7_mtd[i]->module = THIS_MODULE;
 173                         add_mtd_device(impa7_mtd[i]);
 174                         devicesfound++;
 175 #ifdef CONFIG_MTD_PARTITIONS
 176 #ifdef CONFIG_MTD_CMDLINE_PARTS
 177                         sprintf(mtdid, MTDID, i);
 178                         mtd_parts_nb = parse_cmdline_partitions(impa7_mtd[i],
 179                                                                 &mtd_parts,
 180                                                                 mtdid);
 181                         if (mtd_parts_nb > 0)
 182                           part_type = "command line";
 183 #endif
 184                         if (mtd_parts_nb <= 0)
 185                         {
 186                                 mtd_parts = static_partitions;
 187                                 mtd_parts_nb = NB_OF(static_partitions);
 188                                 part_type = "static";
 189                         }
 190                         if (mtd_parts_nb <= 0)
 191                         {
 192                                 printk(KERN_NOTICE MSG_PREFIX
 193                                        "no partition info available\n");
 194                         }
 195                         else
 196                         {
 197                                 printk(KERN_NOTICE MSG_PREFIX
 198                                        "using %s partition definition\n",
 199                                        part_type);
 200                                 add_mtd_partitions(impa7_mtd[i],
 201                                                    mtd_parts, mtd_parts_nb);
 202                         }
 203 #endif
 204                 }
 205                 else
 206                   iounmap((void *)impa7_map[i].map_priv_1);
 207         }
 208         return devicesfound == 0 ? -ENXIO : 0;
 209 }
 210
 211 static void __exit cleanup_impa7(void)
 212 {
 213         int i;
 214         for (i=0; i<NUM_FLASHBANKS; i++)
 215         {
 216                 if (impa7_mtd[i])
 217                 {
 218                         del_mtd_device(impa7_mtd[i]);
 219                         map_destroy(impa7_mtd[i]);
 220                 }
 221                 if (impa7_map[i].map_priv_1)
 222                 {
 223                         iounmap((void *)impa7_map[i].map_priv_1);
 224                         impa7_map[i].map_priv_1 = 0;
 225                 }
 226         }
 227 }
 228
 229 module_init(init_impa7);
 230 module_exit(cleanup_impa7);
 231
 232 MODULE_LICENSE("GPL");
 233 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 234 MODULE_DESCRIPTION("MTD map driver for implementa impA7");